Which is better to colonize: Mars, the Moon, or Deimos?

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Al_
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Deimos has one advantage that the other two don't - near-zero gravity.
Like Mars, it has a day/night cycle that Humans and plants can adapt to. It almost certainly has water ice. The delta v budget is such that it's actually one of the easier places to mine ice to return to Earth orbit. It has locations where a PV panel can give 24/7 power. The near zero-gravity means landing is a low-cost maneouver.
If the spacecraft creates g-force by rotating during it's trip out, it can contiue to do that at Deimos.
It can use Deimos dirt as extra shielding.
 

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